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Segment Reporting - Summary of Revenues from External Customers and Other Financial Information by Reportable Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 29, 2018		Sep. 30, 2017	Sep. 29, 2018		Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,891.6		$ 4,981.5	$ 16,206.1		$ 15,103.2
Segment earnings	363.3		385.2	1,294.4		1,211.0
Depreciation and amortization	119.8		111.7	361.8		313.2
Capital expenditures	160.5		156.2	492.7		430.2
Total assets	12,009.4	[1]	11,712.0	12,009.4	[1]	11,712.0	$ 11,945.9
Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,683.0		3,868.9	12,287.6		11,762.0
E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,208.6		1,112.6	3,918.5		3,341.2
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,683.0		3,868.9	12,287.6		11,762.0
Segment earnings	294.0		298.8	981.8		941.8
Depreciation and amortization	80.1		76.7	241.5		213.2
Capital expenditures	109.2		109.7	335.2		287.1
Total assets	7,311.2		7,413.5	7,311.2		7,413.5
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,208.6		1,112.6	3,918.5		3,341.2
Segment earnings	138.4		155.5	504.3		476.7
Depreciation and amortization	36.1		31.3	109.6		89.0
Capital expenditures	49.8		42.7	150.4		126.2
Total assets	2,578.8		2,262.7	2,578.8		2,262.7
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0	0.0		0.0
Segment earnings	(69.1)		(69.1)	(191.7)		(207.5)
Depreciation and amortization	3.6		3.7	10.7		11.0
Capital expenditures	1.5		3.8	7.1		16.9
Total assets	$ 2,119.4		$ 2,035.8	$ 2,119.4		$ 2,035.8
[1] Unaudited.

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Amount of pretax income or loss for the reportable segment before interest, other (income) expense, provision (benefit) for income taxes and equity in net (income) loss of affiliates.

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